Starting October 1st, Microsoft will start to randomly select tenants and disable basic authentication access for MAPI, RPC, Offline Address Book (OAB), Exchange Web Services (EWS), POP, IMAP, Exchange ActiveSync (EAS), and Remote PowerShell. We will post a message to the Message Center 7 days prior, and we will post Service Health Dashboard notifications to each tenant on the day of the change.
Legacy client apps, such as Office 2010 and Office for Mac 2011, do not support modern authentication and can only be used with basic authentication.
Office 2016 and Office 2019 clients support modern authentication by default…
[NATIVE APP] Modern Authentication support for Exchange accounts
iOS 11 or later, iPadOS 13.1 or later, and macOS 10.14 or later support Microsoft Modern Authentication workflows of Exchange online tenants. OAuth can be used for Office 365 accounts with Modern Authentication enabled. In iOS 12 or later and macOS 10.14 or later, configuration can also be performed manually or with a configuration profile.
In iOS 14 or later and iPadOS 14 or later, Exchange accounts configured for Microsoft cloud-based services (such as Office365 or outlook.com) are automatically upgraded to use Microsoft’s OAuth 2.0 authentication service.
